Bottom supporting structure of butterfly valve

Abstract

The utility model discloses a bottom supporting structure of a butterfly valve, which is mounted at the bottom of a valve body of the butterfly valve and used for supporting a valve shaft of the butterfly valve. Comprising a bottom cover and a supporting rod, a shaft hole is formed in the bottom of a valve body, the bottom cover is installed at the bottom of the valve body, a screw hole communicated with the shaft hole is formed in the bottom cover, a threaded part is arranged on the supporting rod and matched with the screw hole in a threaded mode, and the upper end of the supporting rod extends into the shaft hole to abut against the bottom end of a valve shaft. A sealing assembly is further arranged between the supporting rod and the bottom cover. The valve shaft supporting device has an axial adjusting function and can be adaptively adjusted according to the axial size of a valve shaft, so that the valve shaft is effectively and stably supported, the matching is compact and reliable, the production efficiency of a valve is favorably improved, and the production cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a bottom support structure for a butterfly valve. Background Technology

[0002] A butterfly valve is a type of valve that uses a disc-shaped opening and closing element to rotate approximately 90° to open, close, or regulate the flow of media. Butterfly valves are not only simple in structure, small in size, lightweight, economical in material consumption, compact in installation dimensions, low in driving torque, and easy and quick to operate, but they also simultaneously possess excellent flow regulation and sealing characteristics, making them one of the fastest-growing valve types in the past decade. The use of butterfly valves is very widespread. The variety and quantity used continue to expand, and they are developing towards high temperature, high pressure, large diameter, high sealing performance, long service life, excellent regulation characteristics, and multi-functional applications. Their reliability and other performance indicators have reached a high level.

[0003] Existing butterfly valves include a valve body, a butterfly plate, and a valve shaft. The butterfly plate and valve shaft are fixed together by multiple cylindrical pins. The circular butterfly plate is located within the valve body and can rotate within the valve body thanks to the support of the valve shaft. To prevent axial movement of the valve shaft from causing changes in the position of the butterfly plate, a limiting ring is generally installed at one end of the valve shaft to fix its axial position. However, this structure often requires adjustment of the limiting ring's thickness during assembly due to manufacturing errors, which is cumbersome, inefficient, and costly. Utility Model Content

[0004] The purpose of this invention is to provide a bottom support structure for a butterfly valve. This invention has an axial adjustment function and can be adaptively adjusted according to the axial dimension of the valve shaft, thereby effectively and stably providing support for the valve shaft. The structure is compact and reliable, which helps to improve valve production efficiency and reduce production costs.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a bottom support structure for a butterfly valve, installed at the bottom of the valve body of the butterfly valve, for supporting the valve shaft of the butterfly valve; including a bottom cover and a support rod, wherein the bottom of the valve body is provided with a shaft hole, the bottom cover is installed at the bottom of the valve body, the bottom cover is provided with a threaded hole communicating with the shaft hole, the support rod is provided with a threaded part, the threaded part is threadedly engaged with the threaded hole, and the upper end of the support rod extends into the shaft hole and abuts against the bottom end of the valve shaft, and a sealing assembly is also provided between the support rod and the bottom cover.

[0006] By adopting the above technical solution, the valve shaft, at a specific position, can be supported by adjusting the axial position of the support rod by rotating it, so that the upper end of the support rod abuts against the lower end of the valve shaft. This allows for adaptive adjustment based on the axial dimensions of the valve shaft, effectively and stably providing support. The fit is compact and reliable, which helps improve valve production efficiency and reduce production costs. Furthermore, even if the gap between the valve shaft and the support rod increases due to wear during use, the support rod can be rotated to re-tighten against the valve shaft later, making operation very convenient.

[0007] The present invention is further configured such that a gasket is sandwiched between the support rod and the valve shaft.

[0008] By adopting the above technical solution, the gasket can protect the valve shaft and prevent the valve shaft from directly contacting the support rod, thus avoiding increased wear.

[0009] The present invention is further configured such that the bottom end of the support rod is provided with a first operating part having a square cross-section.

[0010] By adopting the above technical solution, the support rod can be rotated and adjusted by clamping the first operating part with a wrench, making the operation very easy and convenient.

[0011] The present invention is further configured such that a sealing cavity is provided at the lower end of the screw hole corresponding to the bottom cover, and a first limiting step is formed between the sealing cavity and the screw hole. The sealing assembly includes a packing pad, a sealing packing, a packing sleeve and a packing pressure plate, which are sequentially sleeved on the outer periphery of the support rod from top to bottom. The packing pad and the sealing packing are disposed in the sealing cavity. The packing pressure plate is connected to the bottom cover by fasteners, so that the packing sleeve presses the sealing packing and the packing pad tightly on the first limiting step in the sealing cavity.

[0012] By adopting the above technical solution, reliable sealing between the bottom cover and the operating rod can be guaranteed, preventing the medium inside the valve from leaking out through the gap between them.

[0013] The present invention is further configured such that a second limiting step is provided at the lower end of the threaded portion of the support rod, the second limiting step is provided above the packing pad, and the packing pad limits the lower stroke of the second limiting step.

[0014] By adopting the above technical solution, the situation where the support rod leaves the valve shaft due to misoperation can be avoided.

[0015] The present invention is further configured such that the bottom cover is detachably connected to the bottom of the valve body by an internal hexagon screw, and the bottom cover is provided with a positioning flange extending into the shaft hole, and a sealing ring for forming a sealing fit with the inner surface of the shaft hole is installed on the outer circular surface of the positioning flange.

[0016] By adopting the above technical solution, not only is disassembly and assembly easy, but reliable sealing between the bottom cover and the valve body can also be guaranteed, preventing leakage of the internal medium of the valve body from the gap between the two.

[0017] The present invention is further provided that the bottom of the bottom cover is also threadedly connected to a protective cover, the protective cover covering the sealing component and the support rod inside, and the bottom end of the protective cover is provided with a second operating part with a square cross-section.

[0018] By adopting the above technical solution, the sealing components and support rods can be protected, which not only has the function of dust prevention, but also can prevent the occurrence of misoperation.

[0019] The present invention is further configured such that an observation window is provided through the side of the protective cover, and a mounting groove is provided on the outer side of the protective cover corresponding to the outer edge of the observation window, and a transparent observation plate is interference-fitted onto the mounting groove.

[0020] By adopting the above technical solution, staff can observe in real time whether there is any leakage between the support rod and the bottom cover, so as to take quick countermeasures in case of leakage.

[0021] The present invention is further provided in that the edge of the transparent observation plate is provided with an insertion hole for inserting a tool to pry the transparent observation plate out, and the back of the transparent observation plate is provided with a clearance groove corresponding to the bottom of the insertion hole and communicating with the insertion hole.

[0022] By adopting the above technical solution, when the transparent observation plate is damaged in the future, it can be pried out and replaced by inserting a tool into the hole, which is very convenient. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the protective cover of this utility model;

[0025] Figure 3 This is an exploded view of the protective cover of this utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the transparent observation plate of this utility model.

[0027] In the diagram: 1. Valve body; 2. Valve shaft; 3. Bottom cover; 4. Support rod; 5. Shaft hole; 6. Screw hole; 7. Threaded part; 8. Sealing assembly; 9. Gasket; 10. First operating part; 11. Sealing cavity; 12. First limiting step; 13. Packing gasket; 14. Sealing packing; 15. Packing sleeve; 16. Packing pressure plate; 17. Fastener; 18. Second limiting step; 19. Socket head screw; 20. Positioning flange; 21. Sealing ring; 22. Protective cover; 23. Second operating part; 24. Observation window; 25. Mounting groove; 26. Transparent observation plate; 27. Insertion hole; 28. Relief groove. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Example: As attached Figures 1-4 The diagram shows a bottom support structure for a butterfly valve, installed at the bottom of the valve body 1 to support the valve shaft 2. The support structure includes a bottom cover 3 and a support rod 4. The bottom of the valve body 1 has a shaft hole 5. The bottom cover 3 is installed at the bottom of the valve body 1 and has a threaded hole 6 communicating with the shaft hole 5. The support rod 4 has a threaded portion 7, and the portion of the support rod 4 outside the threaded portion 7 is a smooth shaft portion. The threaded portion 7 is threaded into the threaded hole 6, and the upper end of the support rod 4 extends into the shaft hole 5 and abuts against the bottom end of the valve shaft 2. A sealing assembly 8 is also provided between the support rod 4 and the bottom cover 3. When the valve shaft 2 is in a specific position, the axial position of the support rod 4 can be adjusted by rotating the support rod 4, so that the upper end of the support rod 4 abuts against the lower end of the valve shaft 2, thus supporting the valve shaft 2. It can be adaptively adjusted according to the axial dimension of the valve shaft 2, thereby effectively and stably providing support for the valve shaft 2. The fit is compact and reliable, which helps to improve valve production efficiency and reduce production costs. Moreover, even if the gap between the valve shaft 2 and the support rod 4 increases due to wear during use, the support rod 4 can be rotated to re-tighten against the valve shaft 2 later, making the operation very convenient.

[0030] As attached Figure 1 As shown, a gasket 9 is sandwiched between the support rod 4 and the valve shaft 2. The gasket 9 serves to protect the valve shaft 2, preventing direct contact between the valve shaft 2 and the support rod 4, thus avoiding increased wear.

[0031] As attached Figure 1As shown, the bottom end of the support rod 4 is provided with a first operating part 10 with a square cross-section, and the first operating part 10 and the support rod 4 are an integral structure. The support rod 4 can be rotated and adjusted by clamping the first operating part 10 with a wrench, which is very easy and convenient to operate.

[0032] As attached Figure 1 As shown, the bottom cover 3 has a sealing cavity 11 at the lower end of the screw hole 6. A first limiting step 12 is formed between the sealing cavity 11 and the screw hole 6. The sealing assembly 8 includes a packing pad 13, a sealing packing 14, a packing sleeve 15, and a packing pressure plate 16, which are sequentially fitted around the support rod 4 from top to bottom. The packing pad 13 and the sealing packing 14 are disposed within the sealing cavity 11. The packing pressure plate 16 is connected to the bottom cover 3 by a fastener 17, which causes the packing sleeve 15 to press the sealing packing 14 and the packing pad 13 onto the first limiting step 12 within the sealing cavity 11. The fastener 17 is a combination of a bolt or stud and a nut. This design ensures reliable sealing between the bottom cover 3 and the operating rod, preventing leakage of the medium inside the valve from the gap between them.

[0033] As attached Figure 1 As shown, a second limiting step 18 is provided at the lower end of the threaded portion 7 corresponding to the support rod 4. The second limiting step 18 is located above the packing pad 13, and the packing pad 13 limits the lower stroke of the second limiting step 18. This design can prevent the support rod 4 from leaving the valve shaft 2 due to misoperation.

[0034] As attached Figure 1 As shown, the bottom cover 3 is detachably connected to the bottom of the valve body 1 by an internal hexagon screw 19. The bottom cover 3 has a positioning flange 20 that extends into the shaft hole 5. A sealing ring 21 is installed on the outer surface of the positioning flange 20 to form a sealing fit with the inner surface of the shaft hole 5. This design not only facilitates disassembly and assembly but also ensures a reliable seal between the bottom cover 3 and the valve body 1, preventing leakage of the internal medium of the valve body 1 from the gap between them.

[0035] As attached Figure 1 As shown, the bottom of the bottom cover 3 is also threadedly connected to a protective cover 22. That is, the bottom outer circumference of the bottom cover 3 has external threads, and the inner circumference of the protective cover 22 has internal threads that match the external threads. The protective cover 22 covers the sealing assembly 8 and the support rod 4 inside. The bottom end of the protective cover 22 is provided with a second operating part 23 with a square cross-section. The second operating part 23 can be an integral structure with the protective cover 22, or it can be a separate part welded to the protective cover 22. The protective cover 22 can protect the sealing assembly 8 and the support rod 4, not only providing dust protection, but also preventing accidental operation.

[0036] As attached Figures 2-4As shown, an observation window 24 is provided through the side of the protective cover 22. A mounting groove 25 is provided on the outer side of the protective cover 22 corresponding to the outer edge of the observation window 24. A transparent observation plate 26 is interference-fitted onto the mounting groove 25. The transparent observation plate 26 can be made of plastic or acrylic. The transparent observation plate 26 on the protective cover 22 allows workers to observe in real time whether there is a leak between the support rod 4 and the bottom cover 3, enabling rapid response measures in case of a leak.

[0037] As attached Figures 2-4 As shown, the transparent observation plate 26 has an insertion hole 27 at its edge for inserting a tool to pry it out, and a clearance groove 28 on the back of the transparent observation plate 26 corresponding to the bottom of the insertion hole 27, which communicates with the insertion hole 27. If the transparent observation plate 26 is damaged later, it can be easily replaced by inserting a tool into the insertion hole 27 to pry it out.

Claims

1. A bottom support structure for a butterfly valve, installed at the bottom of the valve body (1) of the butterfly valve, for supporting the valve shaft (2) of the butterfly valve; characterized in that: Includes a bottom cover (3) and a support rod (4). The bottom of the valve body (1) is provided with a shaft hole (5). The bottom cover (3) is installed on the bottom of the valve body (1). The bottom cover (3) is provided with a screw hole (6) that communicates with the shaft hole (5). The support rod (4) is provided with a threaded part (7). The threaded part (7) is threadedly engaged with the screw hole (6). The upper end of the support rod (4) extends into the shaft hole (5) and abuts against the bottom end of the valve shaft (2). A sealing assembly (8) is also provided between the support rod (4) and the bottom cover (3).

2. The bottom support structure of a butterfly valve according to claim 1, characterized in that: A gasket (9) is sandwiched between the support rod (4) and the valve shaft (2).

3. The bottom support structure of a butterfly valve according to claim 1, characterized in that: The bottom end of the support rod (4) is provided with a first operating part (10) with a square cross-section.

4. The bottom support structure of a butterfly valve according to claim 1, characterized in that: The bottom cover (3) is provided with a sealing cavity (11) at the lower end of the screw hole (6). A first limiting step (12) is formed between the sealing cavity (11) and the screw hole (6). The sealing assembly (8) includes a packing pad (13), a sealing packing (14), a packing sleeve (15), and a packing pressure plate (16) that are sequentially sleeved on the outer periphery of the support rod (4) from top to bottom. The packing pad (13) and the sealing packing (14) are disposed in the sealing cavity (11). The packing pressure plate (16) is connected to the bottom cover (3) by a fastener (17), which causes the packing sleeve (15) to press the sealing packing (14) and the packing pad (13) on the first limiting step (12) in the sealing cavity (11).

5. The bottom support structure of a butterfly valve according to claim 4, characterized in that: The support rod (4) is provided with a second limiting step (18) at the lower end of the threaded part (7). The second limiting step (18) is located above the packing pad (13), and the packing pad (13) constitutes a lower stroke limit for the second limiting step (18).

6. The bottom support structure of a butterfly valve according to claim 1, characterized in that: The bottom cover (3) is detachably connected to the bottom of the valve body (1) by an internal hex screw (19), and the bottom cover (3) is provided with a positioning flange (20) that extends into the shaft hole (5). A sealing ring (21) for forming a sealing fit with the inner surface of the shaft hole (5) is installed on the outer circular surface of the positioning flange (20).

7. The bottom support structure of a butterfly valve according to claim 1, characterized in that: The bottom of the bottom cover (3) is also threaded with a protective cover (22), which covers the sealing assembly (8) and the support rod (4) inside. The bottom end of the protective cover (22) is provided with a second operating part (23) with a square cross section.

8. The bottom support structure of a butterfly valve according to claim 7, characterized in that: The protective cover (22) has an observation window (24) through the side. The outer side of the protective cover (22) is provided with a mounting groove (25) corresponding to the outer edge of the observation window (24). A transparent observation plate (26) is interference-fitted onto the mounting groove (25).

9. The bottom support structure of a butterfly valve according to claim 8, characterized in that: The transparent observation plate (26) has an insertion hole (27) at its edge for inserting a tool to pry the transparent observation plate (26) out, and a clearance groove (28) is provided on the back of the transparent observation plate (26) at the position corresponding to the bottom of the insertion hole (27) and connected to the insertion hole (27).

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